heat rises... gravity pulls downwards
2007-08-08 21:45:42 · 11 answers · asked by precious 2 in Science & Mathematics ➔ Physics
the law of gravity does not encompass the nature of heat. Heat is not matter, nor it a particle... heat is energy, and it has no mass.. it does not occupy space. Gravity is the force that pulls objects with mass towards the center of a greater dense body (in terrestrial case, towards the earth's center).
It is not "safe" to say that heat defies the law of gravity. the law of gravity is just not applicable to heat.
2007-08-08 22:49:10 · answer #1 · answered by Ami C 2 · 0⤊ 0⤋
Heat does not defy the Law of Gravity.
I presume you are talking about the fact that heated substances tend to rise?
The reason that hot air rises is because the heated air is lighter (less dense) than the cool air which surrounds it and so it rises through it. The same applies to heated water, if it is less dense than the water which surrounds it, it will rise.
If the temperature of tha air or water is raised uniformly, then it will not rise, the Law of Gravity is not broken any more than it is broken when an aircraft or a bird takes to the air.
2007-08-09 08:29:43 · answer #2 · answered by tomsp10 4 · 0⤊ 0⤋
HEAT DOES NOT RISE!
Heat is a form of energy. Energy does not rise or fall, it just is!
As a rule, matter of a higher temperature is less dense then identical matter of a lower temperature (the exception being water which is most dense at 4 degrees Centigrade...hence, ice floats) so it rises as the denser matter pushes down against it.
So in effect gravity causes the cooler matter to fall, thereby displacing the warmer matter upwards, so it's obeying the law of gravity!
2007-08-09 10:59:05 · answer #3 · answered by Oli B 2 · 0⤊ 0⤋
Gravity is the attraction of massive bodies...
Heat has no mass and so the laws of gravity do not apply to it.
Just as we don't know what gravity actually is we can same the same about heat and light.. Funny.. we know what they do and where to look for them and how to measure them but we don't know what they are.
2007-08-09 05:16:50 · answer #4 · answered by simsjk 5 · 0⤊ 0⤋
Heat doesn't rise, hot air rises. When air is heated it expands and becomes less dense. It will essentially float on the denser cold air in the same way that wood floats on water.
2007-08-09 04:53:01 · answer #5 · answered by Anonymous · 3⤊ 0⤋
Heat rises-
another perspective might be to imagine an atmosphere entirely consisting of helium...the only way a balloon could float up into the sky would be if the ballon was full of helium that was heated beyond the temperature of the atmosphere.
2007-08-09 04:57:07 · answer #6 · answered by jemrx2 4 · 0⤊ 1⤋
When air is heated it expands. As the air expands it becomes less dense. This means that a cubic centimeter of hot air is lighter than a cubic centimeter of cold air. Cool air displaces hot air and the hot air rises.
2007-08-09 04:54:05 · answer #7 · answered by Dan Peirce 5 · 2⤊ 0⤋
Hot air is less dense than cool air. Gravity pulls more strongly on the cool air which allows the hot air to rise by floating on the cool air.
2007-08-09 04:50:15 · answer #8 · answered by novangelis 7 · 2⤊ 1⤋
Heat doesn't rise, but hot air is lighter than cold air because the moleculars are closer in cold air, so for a same volume, you have less moleculars in hot air than in cold air. Hot air rises and cold air goes down.
For women it's the opposite.
2007-08-09 05:03:17 · answer #9 · answered by Residente Calle 13 3 · 2⤊ 0⤋
heat flow is controlled by flow of air since when air is heated its becomes lighter as it losses many of its componant it moves up in order to stabilise its mlicules which are more exited due to heat imposed on them
2007-08-09 05:09:17 · answer #10 · answered by vj_123y 1 · 0⤊ 0⤋